* "The River, floodplains and Modern Assam: An Environmental History of the Brahmaputra", Shrutidev Goswami Memorial Annual Lecture, Department of History, Dibrugarh University, March, 2016.
* "Is the Brahmaputra a candidate for a regional environmental history?', Keynote Address, National Conference North East India Regional Environmental History, Assam University, Diphu Campus, November, 2014,
*"A River Writes Its Own History: Few Ideas for a possible environmental history of the river Brahmaputra', L. Devi Memorial Lecture, Cotton College, Assam, 2013.
*“Dancing Like Nataraj: Earthquakes and Environmental History of the Brahmaputra River Valley”, Agrarian Studies Seminar, Yale University, 2012.
* "Tragic Fate of a Floodplain: What Happened to Certain Schemes in the Brahmaputra River Valley?", Center for India and South Asia, University of California, LA, 2012.
* "Writing for the Nation and Inventing a Nation: Suryya Kumar Bhuyan’s Histories", South Asia Seminar, Department of South Asian Languages and Civilizations, University of Chicago, 2012.
* Earthquakes and Environmental History: Exploring the Modern Fate of the Brahmaputra River Valley", Yale School of Forestry and Environment, Yale University, 2012.
* ‘From Tribesman to Farmer: Explaining Deforestation in Northeastern India’, South Asian Studies Colloquium, Yale University, January, 2011.
* 'Land Rights, Revenue Policy and Peasants in Assam', Arun Chandra Bhuyan Memorial Talk, Jorhat, 2009.
* Peasant Uprising, Oral Tradition and Historical Imagination: An Essay on the Social History of a Peasant uprising in Assam, 1894-1994, School of Oriental and African Studies, 2006.
*“Dancing Like Nataraj: Earthquakes and Environmental History of the Brahmaputra River Valley”, Agrarian Studies Seminar, Yale University, 2012.
* "Tragic Fate of a Floodplain: What Happened to Certain Schemes in the Brahmaputra River Valley?", Center for India and South Asia, University of California, LA, 2012.
* "Writing for the Nation and Inventing a Nation: Suryya Kumar Bhuyan’s Histories", South Asia Seminar, Department of South Asian Languages and Civilizations, University of Chicago, 2012.
* Earthquakes and Environmental History: Exploring the Modern Fate of the Brahmaputra River Valley", Yale School of Forestry and Environment, Yale University, 2012.
* ‘From Tribesman to Farmer: Explaining Deforestation in Northeastern India’, South Asian Studies Colloquium, Yale University, January, 2011.
* 'Land Rights, Revenue Policy and Peasants in Assam', Arun Chandra Bhuyan Memorial Talk, Jorhat, 2009.
* Peasant Uprising, Oral Tradition and Historical Imagination: An Essay on the Social History of a Peasant uprising in Assam, 1894-1994, School of Oriental and African Studies, 2006.